<html>
<head>
<title>random test</title>
<script src="../jquery.js"></script>
<script type="text/javascript">
var cl= console.log,
	json= JSON.stringify;
function clj( e){
	console.log(JSON.stringify(e));
}


$("#inputfeld").keydown(function(e) {
	if( e.keyCode === 13) {
		e.preventDefault();
		e.stopPropagation();
		e.stopImmediatePropagation();
		return;
	}
    alert(e.keyCode);
});


</script>
</head>
<body>
<form action="google.com">
<input value="gna!" id="inputfeld" />
</form>
</body>
</html>